Having a manizer (that's the opposite of womanizer I just invented)

Good luck with popularizing that. 'Manizer' seems close to the view that sex 'makes' a man, which fits with the sexist attitude it simultaneously stains a womans virtue. A gender flip of 'womanizer' isn't obvious or uncontroversial. Cougar? Pant chaser? Man eater? Femme Fatale?? Each seems to have a slightly differ sense, and most are intentional slurs, whereas their male counterparts seem complimentary.

A woman (or girl) energetically 'seducing' multiple men (if she's moderately attractive, almost no effort may be required) would probably just be called a slut, or worse a cheap slut. The stereotypical double standard of men being sexually voracious, while women are sexually parsimonious, is sturdy because many of both genders consider it complimentary and natural.

[a] drunk, devil-may-care female character is actually subverting the trope that only men can be convicted bachelors and women all want to get married and have a family

but not very successfully. Also I find it very difficult to

imagine a scenario in which a female soldier character going insane because of the horrors of war would be accused of sexism

because there are so few portrayals of female soldiers, let alone realistic ones. Most military roles available to women aren't direct combat, they're not exposed directly to 'the horrors of war', though a very small numbers are trying, to fight stigma and because it pays more.

They're almost always portrayed as either victims (like The General's Daughter), and usually side characters (like Rodriguez in Avatar or Battle Los Angeles). The only exception I can recall, G.I. Jane, was a poorly recieved film. If there was a contemporary film made with about a soldier by a lead actress, it would probably be something topical like the story of LaVena Johnson, or Cheryl James.